MCQOPTIONS
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MCQOPTIONS
This section includes 180 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
The correct sequence of the following parameters in order of their maximum to minimum influence on tool life is |
| A. | feed rate, depth of cut, cutting speed |
| B. | depth of cut, cutting speed, feed rate |
| C. | cutting speed, feed rate, depth of cut |
| D. | feed rate, cutting speed, depth of cut |
| Answer» D. feed rate, cutting speed, depth of cut | |
| 152. |
In determining the various forces on the chip, Merchant assumed that the |
| A. | cutting edge of the tool is sharp and it does not make any flank contact with the workpiece |
| B. | only continuous chip without built-up-edge is produced |
| C. | cutting velocity remains constant |
| D. | all of the above |
| Answer» E. | |
| 153. |
In the relation = , the value of n for carbide tools is |
| A. | 0.1 to 0.2 |
| B. | 0.20 to 0.25 |
| C. | 0.25 to 0.40 |
| D. | 0.40 to 0.55 |
| Answer» C. 0.25 to 0.40 | |
| 154. |
An operation of embossing a diamond shaped pattern on the surface of a workpiece, is known as |
| A. | counter-boring |
| B. | grooving |
| C. | knurling |
| D. | facing |
| Answer» D. facing | |
| 155. |
The grooving is an operation of |
| A. | bevelling the extreme end of a workpiece |
| B. | embossing a diamond shaped pattern on the surface of a workpiece |
| C. | reducing the diameter of a workpiece over a very narrow surface |
| D. | enlarging the end of a hole cylindrically |
| Answer» D. enlarging the end of a hole cylindrically | |
| 156. |
Cutting fluids are used to |
| A. | cool the tool |
| B. | improve surface finish |
| C. | cool the workpiece |
| D. | all of these |
| Answer» E. | |
| 157. |
The structure of a grinding wheel depends upon |
| A. | hardness of the material being ground |
| B. | nature of the grinding operation |
| C. | finish required |
| D. | all of these |
| Answer» E. | |
| 158. |
Flank wear occurs mainly on the |
| A. | nose part, front relief face and side relief face of the cutting tool |
| B. | face of the cutting tool at a short distance from the cutting edge |
| C. | cutting edge only |
| D. | front face only |
| Answer» B. face of the cutting tool at a short distance from the cutting edge | |
| 159. |
In a plain milling cutter, the chip space between the back of one tooth and the face of the next tooth is called |
| A. | face |
| B. | fillet |
| C. | gash |
| D. | land |
| Answer» D. land | |
| 160. |
In which of the following machine, the work rotates and the tool is stationary? |
| A. | Vertical boring machine |
| B. | Horizontal boring machine |
| C. | Precision boring machine |
| D. | Jig boring machine |
| Answer» B. Horizontal boring machine | |
| 161. |
The cutting fluid mostly used for machining alloy steels is |
| A. | water |
| B. | soluble oil |
| C. | dry |
| D. | sulphurised mineral oil |
| Answer» E. | |
| 162. |
Which of the following statement is wrong as regard to down milling? |
| A. | It can not be used on old machines due to backlash between the feed screw of the table and the nut. |
| B. | The chips are disposed off easily and do not interfere with the cutting. |
| C. | The surface milled appears to be slightly wavy. |
| D. | The coolant can be poured directly at the cutting zone where the cutting force is maximum. |
| Answer» D. The coolant can be poured directly at the cutting zone where the cutting force is maximum. | |
| 163. |
In reaming process |
| A. | metal removal rate is high |
| B. | high surface finish is obtained |
| C. | high form accuracy is obtained |
| D. | high dimensional accuracy is obtained |
| Answer» D. high dimensional accuracy is obtained | |
| 164. |
The process of changing the shape of grinding wheel as it becomes worn due to breaking away of the abrasive and bond, is called |
| A. | truing |
| B. | dressing |
| C. | facing |
| D. | clearing |
| Answer» B. dressing | |
| 165. |
If the cutting speed is increased, then the built-up-edge |
| A. | becomes longer |
| B. | may or may not form |
| C. | becomes smaller and finally does not form at all |
| D. | has nothing to do with speed |
| Answer» D. has nothing to do with speed | |
| 166. |
The negative rake is usually provided on |
| A. | high carbon steel tools |
| B. | high speed steel tools |
| C. | cemented carbide tools |
| D. | all of these |
| Answer» D. all of these | |
| 167. |
The tool life is affected by |
| A. | depth of cut |
| B. | cutting speed |
| C. | feed |
| D. | all of these |
| Answer» E. | |
| 168. |
The ductile materials, during machining, produce |
| A. | continuous chips |
| B. | discontinuous chips |
| C. | continuous chips with built up edge |
| D. | either (a) or (c) |
| Answer» E. | |
| 169. |
Relief angles on high speed steel tools usually vary from |
| A. | 0° to 3° |
| B. | 3° to 10° |
| C. | 10° to 20° |
| D. | 20° to 30° |
| Answer» C. 10° to 20° | |
| 170. |
Discontinuous chips are formed during machining of |
| A. | brittle metals |
| B. | ductile metals |
| C. | hard metals |
| D. | soft metals |
| Answer» B. ductile metals | |
| 171. |
A drill mainly used in drilling brass, copper or softer materials, is |
| A. | flat drill |
| B. | straight fluted drill |
| C. | parallel shank twist drill |
| D. | tapered shank twist drill |
| Answer» C. parallel shank twist drill | |
| 172. |
In a planer |
| A. | tool is stationary and work reciprocates |
| B. | work is stationary and tool reciprocates |
| C. | tool moves over stationary work |
| D. | tool moves over reciprocating work |
| Answer» B. work is stationary and tool reciprocates | |
| 173. |
Which of the following operation is first performed? |
| A. | Spot facing |
| B. | Boring |
| C. | Tapping |
| D. | Drilling |
| Answer» E. | |
| 174. |
The size of a lathe is specified by the |
| A. | length between centres |
| B. | swing diameter over the bed |
| C. | swing diameter over the carriage |
| D. | all of these |
| Answer» E. | |
| 175. |
The cutting angle of a flat drill varies from |
| A. | 3° to 8° |
| B. | 20° to 30° |
| C. | 60° to 90° |
| D. | 90° to 120° |
| Answer» E. | |
| 176. |
In electro-discharge machining, dielectric is used to |
| A. | help in the movement of the sparks |
| B. | control the spark discharges |
| C. | act as coolant |
| D. | all of these |
| Answer» E. | |
| 177. |
The floating position of the holding fixture in a rotary transfer device is used to |
| A. | improve the accuracy of location |
| B. | reduce the tendency to over-index |
| C. | improve upon the acceleration and deceleration characteristics |
| D. | reduce the cycle time |
| Answer» E. | |
| 178. |
The operation of smoothing and squaring the surface around a hole is known as |
| A. | counter-sinking |
| B. | counter-boring |
| C. | trepanning |
| D. | spot facing |
| Answer» E. | |
| 179. |
In metal cutting operations, the shear angle is the angle made by the shear plane with the |
| A. | direction of the tool axis |
| B. | direction of tool travel |
| C. | perpendicular to the direction of the tool axis |
| D. | central plane of the workpiece |
| Answer» C. perpendicular to the direction of the tool axis | |
| 180. |
In case of turning or milling, the surface roughness is expected to be in the range |
| A. | 20 to 50 |
| B. | 5 to 15 |
| C. | 50 to 100 |
| D. | 100 to 250 |
| E. | 250 to 500 |
| Answer» E. 250 to 500 | |